#include <stdio.h>

int main()
{
    int a;
    scanf("%d", &a);
    switch(a)
    {
        case 0:
        printf("0\n");
        break;
        case 1:
        printf("1\n");
        break;
        case 2:
        printf("2\n");
        break;
        case 3:
        printf("3\n");
        break;
        case 4:
        printf("4\n");
        break;
        default:
        printf("hello world\n");
    }
    printf("end\n");
    return 0;
}

